George Khobra
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George Khobra's Discussions

OF_LOITER performance

Started this discussion. Last reply by George Khobra Feb 28, 2012. 2 Replies

Hello Arducopter team,I recently tried out the OF_LOITER mode on my 3DR quadrotor frame. However I did not observe any position hold in it. I browsed through the code and it seems to implement a…Continue

Position and navigation with a camera

Started Jan 10, 2012 0 Replies

Hey All,Has anyone attempted to do position hold or vision based navigation using a camera. I know there is an optical flow sensor that promises that to some extent. However I want to try achieving a…Continue

Arducopter crash in loiter mode

Started this discussion. Last reply by George Khobra Nov 20, 2011. 42 Replies

Hi DIY community,Flying this arducopter is turning out to be the biggest nightmare of my life. I have been using a jDrones frame with the standard 850kV motors and 20 amp ESCs. I assembled the frame…Continue

Tags: mode, loiter, crash

Arducopter drifting on axis between motor 4 and 1

Started this discussion. Last reply by Geir Engebakken Nov 17, 2011. 11 Replies

Hello DIY community,I am a noob to ardupilot and quadrotors so please bear with me. I recently got my Arducopter kit, assembled it, got it connected and calibrated very smooth and nicely. I then…Continue

Tags: drift, Arducopter

 

George Khobra's Page

Latest Activity

George Khobra replied to George Khobra's discussion OF_LOITER performance
"No Love Community?? Atleast some of you might have tried to use it? I have been playing with the PID values, but looks like its not doing anything"
Feb 28, 2012
George Khobra replied to George Khobra's discussion OF_LOITER performance
"I forgot to mention, I have a sonar sensor onboard as well. I believe those two should suffice.. Please optical flow people, any help?"
Feb 22, 2012
George Khobra posted a discussion

OF_LOITER performance

Hello Arducopter team,I recently tried out the OF_LOITER mode on my 3DR quadrotor frame. However I did not observe any position hold in it. I browsed through the code and it seems to implement a position PID which seems to be the right idea. Could someone who has gotten position hold with the OptFlow sensor, explain to me what the issue is? Is it merely tuning the gains of the PID? If so I would appreciate if you could share briefly your process for tuning it. Any help/ suggestions/ thoughts…See More
Feb 21, 2012
George Khobra commented on Randy's blog post ADNS3080 Optical flow sensor now available in the DIYDrones store!
"Hi Randy, could you tell me what I need to tune and how, in order to achieve the level of performance you showed in the video? It looks really cool. I have the optical flow and sonar mounted and flying with v2.3/v2.4 at the moment on the standard…"
Feb 20, 2012
George Khobra commented on Jean-Louis Naudin's blog post ArduCopter in action: Testing the QuadCopter (HIL mode) on X-Plane v9
"Hello Jean, This is some great work simulating arducopter flight behavior. Do you know what sensing data can the simulator reproduce? I am modifying the firmware for odometry based navigation in addition to using the GPS at low altitudes. As of now…"
Jan 19, 2012
George Khobra commented on Randy's blog post ADNS3080 Optical flow sensor now available in the DIYDrones store!
"Dave, did you manage to get any tests done?"
Jan 17, 2012
George Khobra posted a discussion

Position and navigation with a camera

Hey All,Has anyone attempted to do position hold or vision based navigation using a camera. I know there is an optical flow sensor that promises that to some extent. However I want to try achieving a perfect hover and navigation. Plus I was planning it indoors with good precision.ThanksGeorgeSee More
Jan 10, 2012
George Khobra replied to George Khobra's discussion Arducopter crash in loiter mode
"yea I get these values correctly in test>radio... Thats what I find strange... I can even control it in the roll, pitch, yaw directions. The only problem is that after sometime (or some flying).. The radio max values change a little. So for…"
Nov 20, 2011
Geir Engebakken replied to George Khobra's discussion Arducopter crash in loiter mode
"Hmm that sound strange, I dont get any message about TX not being setup. What do you get in test/radio in Terminal/CLI.   It should show 0 on ch 1,2, 3, and 4 (throttle stck at bottom, the rest in middle). Moving sticks should show about -4500…"
Nov 20, 2011
George Khobra replied to George Khobra's discussion Arducopter crash in loiter mode
"Hey Geir, I used Mission Planner to calibrate it a bunch of times. However everytime in CLI it warns me that the radio is not setup. The interesting thing is that when I rolled back to version 2.0.40 of the firmware, I did not get these errors.. Any…"
Nov 20, 2011
Martin Szymanski replied to George Khobra's discussion Arducopter crash in loiter mode
"Another possibility is that the ppm (pwm) signal is too close to a mode change. Or your RC radio connection looses signals at a certain times."
Nov 18, 2011

Moderator
Michael Pursifull replied to George Khobra's discussion Arducopter crash in loiter mode
"Members"
Nov 18, 2011
George Khobra replied to George Khobra's discussion Arducopter crash in loiter mode
"Thats great advise Mike. Appreciate it! I am going to go over it step by step once I am done fixing this frame tonight. BTW where can I find local meet-up groups. Didnt really see anything on the website."
Nov 18, 2011
George Khobra replied to George Khobra's discussion Arducopter crash in loiter mode
"@Chris, Mike and Jonis: YES I had GPS lock. I always check it before arming my motors outdoors."
Nov 18, 2011
Jonis Maurin Ceara replied to George Khobra's discussion Arducopter crash in loiter mode
"I ALWAYS wait for GPS lock before anything.....even arming motors!    "
Nov 18, 2011

Developer
Rob_Lefebvre replied to George Khobra's discussion Arducopter crash in loiter mode
"Any chance that whatever switch you are using to go into Loiter mode is also mixing to the pitch channel?   Ie: Jason is saying there was a pitch forward command, you say you didn't give it.  Just an idea.   Jason, how do you…"
Nov 18, 2011

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Engineer at GE
Please tell us a bit about your UAV interest
A newbie with interest in rotor UAVs

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